CrypTool 2 (CT2) is an open-source program offering an innovative visual programming GUI to experiment with cryptographic procedures and to animate their cascades.
Article about solving the Double-Transposition Challenge in Cryptologia
A level X challenge in MysteryTwister C3 by Klaus Schmeh using the double-column transposition cipher withstood a long time against cryptanalysis efforts. Nevertheless, it was solved in November 2013 by George Lasry. (2014-06-25)
The 10th Beta of CrypTool 2 was released on 19th October 2013. You are cordially invited to test and give feedback. Final version of CT 2 is planned to be published in July 2014.
Third public beta of CrypTool 1.4.31
The new CrypTool 1.4.31 beta is ready. This version is now available in 6 languages German, English, Spanish, Polish, Serbian and Greek. We would appreciate if you test this beta in detail and give us feedback. The release version of CT 1.4.31 is scheduled for mid 2014. (2013-10-04)
Land der Ideen - Statements
"Installing CrypTool only requires a few clicks of the mouse, and learning how to use the application is equally straightforward. There is also an extensive amount of help available in each tutorial. In addition, new crypto algorithms and attacks are constantly being added to the (already impressive) CrypTool suite, making it ever more comprehensive in its scope."